Oil well pump



o. F. MAT'l HEWS ET AL 2,067,774

Jan. 12, 1937.

OIL WELL PUMP Filed April 4, 1956 QEMaithews INVENTOR ATTORNEY v Patented Jan. 12, 1937 curl-Ensures "PATE T OFFICE if or' i -rrmtthews and sen'ntt' I. Hill,

This invention relates to oil'wel-l, pumps in whichtelescoping tubes create a suction which draws .the fluid in through the intake valve on the up stroke and discharges thefluid through the outlet valve on the down stroke.

Pumps of this character, including a stationary or standing tube, and traveling inner and outer telescoping tubes on the standing tube, are usually inserted in the well on rods, and it has always been extremely difiicult to keep the standing tube from dropping from the traveling tubes because of the unreliability of the device which anchors the tubes together during insertion into the well.

An object of the present invention is to provide an anchoring and pulling nipple having a tapered left hand screw threaded end which may be screwed into a similar shaped and threaded socket in the bore of the standing or stationary tube to securely anchor the stationary tube to the traveling tubes while the pump is being lowered into the well, it being only necessary to take about five turns to the right with the rod to unscrew the nipple from its seat in the standing tube to detach the traveling tubes from the stationary tube when the pump has been inserted in the well. By virtue of the left hand thread on the parts, as described, unscrewing of the right hand threaded joints of the tubes will be positively prevented when the anchoring nipple is being applied to or removed from the stationary tube.

With the above and other objects in View the invention consists of certain novel details of construction and combinations of parts hereinafter fully described and claimed, it being understood that various modifications may be resorted to within the scope of the appended claims without departing from the spirit or sacrificing any of the advantages of the invention.

In the accompanying drawing forming part of this specification,

Figure 1 is a longitudinal sectional view through an oil well pump constructed in accordance with the invention.

Figure 2 is a detail longitudinal sectional view showing the anchoring nipple screwed into the socket in the bore of the standing tube to attach the standing tube to the traveling tubes preparatory to lowering the pump into the well.

Figure 3 is a side elevation showing the an-' choring nipple and the inner traveling tube by which it is carried.

Figure 4 is a detail sectional view showing a modified form of pump in which the bore of the inner traveling tube is not vented through the separate vacuum space between the traveling tubes and the stationary tube.

Referring now to the drawing in which like characters of reference designate similar parts in the various views, Ill designates the outlet the inner traveling tube I4. The bushing is externally' threaded to receive the internally threaded upper end of the outer traveling tube and. a nipple I5 is screwed on to the lower end of the bushing and is screwed into the upper end of the inner traveling tube [4. The bushing is provided with perforations l 6 which release pressure which may exist in the vacuum space I! between the inner and outer traveling tubes and the stationary tube I 8 which is telescopically received betweenthe traveling tubes.

The stationary tube I 8 is provided with a valve seat IS in which is seated a ball valve 20 that is limited in opening movement by a spider stop 2|. The stationary tube is further provided with a nipple 22 having resilient fingers 23 terminating in guide tips 24 adapted to seat the stationary tube in the usual seating tube 25 in the well.

In applying the invention to an oil well pump of the above described type, an anchoring and pulling nipple 26 is provided at the upper end with exterior screw threads 21 which engage interior screw threads 28 at the lower end of the inner traveling tube M to attach the nipple to the inner traveling tube. A valve seat 29 is formed in the top of the nipple to receive a ball valve 30 which is limited in opening movement by a stop pin 3| disposed transversely in the inner traveling tube. The nipple is provided with a tapered conical tip 32 at the bottom and this tip is provided with a left hand coarse screw thread 33.

The lower end of the standing or stationary tube I8 is provided with an internal tapered bore 34 which is provided with a coarse left hand screw thread 35 to receive the left hand screw thread 33 of the anchoring nipple 26 and securely couple the reciprocating part of the pump, that is, the traveling tubes I3 and M, to the stationary tube l8.

The seating tube 25 is anchored in the well, and after it is anchored the three tubes I3, l4, and I8, which are telescoped together are secured to a long rod (not shown) suificient in length to reach to the bottom of the well, by means of an attaching stem 36 on the outlet valve cage l3.

Prior to the tubes being made up, as it is called, on the rod, the traveling tubes l3 and M may be moved until the pulling and anchoring nipple 26 enters the tapered bore 34 of the standing tube whereupon the traveling tubes may be rotated as a unit to screw the nipple 26 into the bore 34 and tightly assemble the traveling tubes with the stationary tube. Thereupon the pump may be lowered into the Well without danger of the standing tubedropping from the traveling tubes during the lowering operation. When the standing tube is seated upon the seating tube 25 the operator may now unscrew the traveling tubes from the stationary tube by simply rotating the rods in a right hand direction, and the pump is ready f or operation.

The pump may be pulled from the well by again screwing the nipple 26 into the bore '34 to couple the traveling tubes to the stationary tube, and lifting the coupled tubes from the well 'by means of the rod. During unscrewing of the traveling tubes from the stationary tube due to the thread on the pulling and anchoring nipple 26being left hand the sections of the pump cannot become separated from each other since the joints of the various sections are made by right hand threads.

In operation after the pump is anchored in the well the traveling tubes [3 and M are raised the length of their stroke in the Well. This draws the fluid in through the valve 20, up through the valve 30, to fill the bore of the pump. During the down stroke of the traveling tubes l3 and M the fluid is discharged through the upper valve ll of the pump.

In Figure 4 there is shown a modification or' the pump structure in which the reciprocating bushing 31 carries the inner traveling tube 38 and the outer traveling tube 39- which receive between them the standing or stationary tube 40. In this modification of the device it will be noted there are no vent openings to vent the vacuum chamber 4| to the bore of the pump, the close fit about .020", of the tubes preventing fluid or sand entering between the telescopingrtubes.

From the above description it is thought that the construction and operation of the invention will be fully understood without further explanation. 7

A well pump 'includinginner and outer travelprovided with a left hand screw thread, a standing stationary tube telescopically .received 'between the traveling tubes, an intake valve in the 'bore of the stationary tube, and a conical seat in the bore of the stationary tube above the intake valve having a left hand'screw thread adapted to receivethe similarly threaded end of said nipnle for coupling all of the tubes together as a-unit when the pump is to be loweredinto a well.

oRRIN F. MATTHEWS. SENNETT I. HILL. 

